{
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      "strike": null,
      "target_key": "2026-12-29",
      "message_short": "LOW tier (direct straddle)",
      "message_long": "Accept tier: LOW (DIRECT_STRADDLE_ONLY path)",
      "metrics": {}
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      "code": "low_tier",
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      "interval_to": null,
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      "target_key": "2027-03-30",
      "message_short": "LOW tier (direct straddle)",
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      "metrics": {}
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      "scope": "expiry",
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      "expiry_dt": "2027-06-29",
      "interval_from": null,
      "interval_to": null,
      "strike": null,
      "target_key": "2027-06-29",
      "message_short": "Rejected: insufficient_strikes",
      "message_long": "Expiry rejected: insufficient_strikes",
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      "interval_to": "2026-08-25",
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      "message_short": "LOW confidence",
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    },
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    "build_metadata": {
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      "source": "market_calendar.list_upcoming_events",
      "id_namespace": "market_calendar",
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}